Kugel is frozen and vacuum sealed. Remove from sealed bag. You can partially thaw it out and pop it out of the pan onto a cutting board. Use a heavy knife to press down and cut across the kugel. You can cut individual serving size pieces, wrap in small zip lock bags and refreeze OR to use all at one meal, completely defrost before heating BUT when partially defrosted cut into serving pieces before heating. Two heating methods:
Remove individual serving pieces and place on microwave safe plate. Cover loosely with plastic wrap or microwave dish cover. Heat in microwave for a minute or two on high or until hot.
Put the whole aluminum foil pan on a cookie sheet because if you have cut the servings in the pan, there may be slits in the pan bottom where butter will leak out. Cover pan with foil and reheat in 350 oven until hot (25-30 minutes as ovens vary).